JP3028482B1 - Moving agricultural machine - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To select a turning characteristic such as an insensitive turning feeling or an agile turning feeling. SOLUTION: A driving force is transmitted to a left and right traveling crawler (2) through a speed change member (25) capable of changing a traveling speed steplessly by operating a traveling speed change lever (73).
In a mobile agricultural machine in which the steering speed of the left and right traveling crawlers (2) is changed steplessly by operating the steering member (28) with the steering handle (19), the difference is proportional to the operation amount of the steering handle (19). (17)
8) and the transmission member (2) to the travel transmission lever (73).
5), and a transmission member (25) is connected to the traveling transmission lever (73) via the cooperative system path (178) and another third system path (179).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile agricultural machine such as a combine or tillage tractor or a field management vehicle for continuously cutting and threshing grain culms in a field.

[0002]

Conventionally, a driving force is transmitted to left and right traveling crawlers via a belt or a hydraulic stepless transmission mechanism capable of continuously changing the traveling speed by operating a traveling speed change lever to move at an arbitrary vehicle speed. In addition, there is a technique for operating a continuously variable transmission mechanism for steering with a steering handle to control a differential mechanism, changing the drive speed difference between the left and right traveling crawlers in a stepless manner, and changing the traveling course. However, if the steering operation of the steering wheel alone is performed, the vehicle speed is maintained substantially constant between straight traveling and turning, and when performing a spin turn operation with a small turning radius, it is necessary to perform a deceleration operation with the traveling shift lever. Yes, it is necessary to perform both the steering handle operation and the traveling speed change lever operation when turning in the field headland. Therefore, by automatically decelerating the vehicle speed in conjunction with the steering wheel operation and automatically increasing the vehicle speed to the original vehicle speed in conjunction with the steering wheel operation returning to straight running, the spin turn is performed only by the steering wheel operation Operation can be slowed down to the appropriate vehicle speed, which can save troublesome traveling shifting operations.However, there is a problem in that work efficiency is reduced by deceleration when work that does not require spin turns, and traveling performance is reduced by deceleration when working in wet fields. Is reduced. Also, if the reduction ratio of the vehicle speed to the steering wheel operation amount is reduced,
There is a problem that a quick turning operation cannot be obtained on a road or in a dry field, and the turning performance (spin turn) performance particularly in dry field work is reduced.

[0003]

According to the present invention, a driving force is transmitted to left and right traveling crawlers via a speed change member capable of changing a traveling speed steplessly by operating a traveling speed change lever, and a steering wheel is operated by a steering handle. In a mobile agricultural machine that changes the drive speed of the left and right traveling crawlers steplessly by operating the steering member, the speed is shifted to the traveling shift lever via a cooperative system that reduces the vehicle speed in proportion to the amount of operation of the steering wheel. In addition to connecting the members, the transmission member is connected to the traveling speed change lever in the third cooperative path and another cooperative path, and the transmission member is controlled by selectively using the cooperative path and the third system path. The turning performance and running performance can be changed without changing the structure, and turning characteristics such as insensitive turning feeling or agile turning feeling can be easily selected.

A feeling switching member for selecting a deceleration input from the cooperative system and a shift operation input from another third system is provided. The switching of the shift control using the system can be easily performed by operating the feeling switching member, so that the steering function can be improved and the handling operation can be simplified.

Further, the speed change member is controlled by selecting one of a deceleration input from a cooperative system path and a shift operation input from another third system path on the same axis. This facilitates simplification and downsizing of the traveling transmission lever, the steering handle, and the coupling mechanism between the transmission member, and facilitates improvement of workability such as assembly and adjustment.

[0006] A spin-turn turning travel in which the traveling crawler inside the turning is reversed, and a non-spin-turn turning travel in which the rotation direction of the traveling crawler inside the turning is maintained in the same direction as the outer traveling crawler with the maximum operation amount of the steering wheel. It is possible to switch the selection freely, it is possible to make a quick turn on the road or dry field by selecting the spin turn turning, and the turning performance on wet or muddy surface etc. by selecting the non-spin turn turning. It is possible to easily improve the steering function and the handling operability by switching the turning characteristic.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. Fig. 1 is an overall side view of the combine, Fig. 2
Is a plan view of the same, in which (1) is a track frame on which a pair of left and right traveling crawlers (2) are mounted, (3) is a machine frame installed on the track frame (1), and (4) is a feed chain. A threshing unit which stretches (5) to the left and incorporates a handling cylinder (6) and a processing cylinder (7), and (8) a cutting unit provided with a cutting blade (9) and a grain culm transport mechanism (10). , (11) are hydraulic cylinders for raising and lowering the cutting unit (8) via the cutting frame (12), (13) is a straw processing unit facing the end of the straw chain (14), and (15) is a threshing unit ( A grain tank that carries the grains from 4) through a frying cylinder (16), (1
7) a discharge auger for carrying out the grains of the tank (15) out of the machine, (18) a driver's cab provided with a round steering handle (19) and a driver's seat (20), and (21) a driver's seat (2
0) An engine provided below, configured to continuously cut and thresh grain culms.

Further, as shown in FIG. 3, a transmission case (22) for driving the traveling crawler (2) includes a pair of a first hydraulic pump (23) and a first hydraulic motor (24).
And a pair of a second hydraulic pump (26) and a second hydraulic motor (27) for forming a hydraulic continuously variable transmission mechanism for traveling main transmission. A steering member (28) forming a continuously variable transmission mechanism; and an input shaft (29a) (29b) of the first and second hydraulic pumps (23) (26) on an output shaft (21a) of the engine (21). )
Are connected by transmission belts (30a) (30b),
The hydraulic pumps (23) and (26) are configured to be driven.

The auxiliary transmission mechanism (32) and the differential mechanism (3) are connected to the output shaft (31) of the first hydraulic motor (24).
3) through the driving wheels (3) of the left and right traveling crawlers (2).
The differential mechanism (33) has a pair of left and right symmetric planetary gear mechanisms (35) and (35), and each planetary gear mechanism (35) has one sun gear (36).
, Three planetary gears (37) meshed on the outer periphery of the sun gear (36), and a ring gear (38) meshed with the planetary gears (37).

The planetary gear (37) is rotatably supported on a carrier (41) of a carrier shaft (40) on a coaxial line with a sun gear shaft (39), and sandwiches left and right sun gears (36) and (36). The left and right carriers (41) are arranged to face each other, and the ring gear (38) has internal teeth (38a) meshing with each planetary gear (37) and is arranged on the same axis as the sun gear shaft (39). The carrier shaft (4) is rotatably supported on the shaft (40).
0) is extended to form an axle to support the drive wheel (34).

A traveling hydraulic continuously variable transmission member (2)
5) The forward / reverse rotation of the first hydraulic motor (24) and the control of the number of rotations are performed by adjusting the angle change of the rotary swash plate of the first hydraulic pump (23), and the rotation of the first hydraulic motor (24) is performed. The output is transmitted from the transmission gear (42) of the output shaft (31) to each gear (4).
3) A center gear (46) fixed to the sun gear shaft (39) via (44) (45) and the auxiliary transmission mechanism (32).
To rotate the sun gear (36). The sub-transmission mechanism (32) includes a sub-transmission shaft (47) having the gear (44) and a parking brake shaft (49) having a gear (48) that meshes with a center gear (46) via the gear (45). ), And a pair of low-speed gears (50) (5) between the auxiliary transmission shaft (47) and the brake shaft (49).
1) Medium-speed gear (52) (53) High-speed gear (5
4) By providing (48), the low-medium-speed slider (55) and the high-speed slider (56) are slid to switch the sub-transmission between low speed, medium speed, and high speed. Note that there is neutrality between low and medium speeds and between medium and high speeds. In addition, a parking brake (57) is provided on the brake shaft (49), and a cutting PTO that transmits torque to the cutting unit (8).
The auxiliary transmission shaft (47) is connected to the shaft (58) via gears (59) and (60) and a one-way clutch (61), and the mowing unit (8) is driven at the vehicle speed synchronization speed.

As described above, the driving force from the first hydraulic motor (24) transmitted to the sun gear shaft (39) via the center gear (46) is applied to the left and right planetary gear mechanisms (35).
And to the left and right carrier shafts (40) via
The rotation transmitted to the left and right carrier shafts (40) is transmitted to the left and right drive wheels (34), respectively, to drive the left and right traveling crawlers (2).

Further, a steering member (28) formed by a turning hydraulic continuously variable transmission mechanism is provided with a second hydraulic motor (27) by adjusting an angle of a rotary swash plate of a second hydraulic pump (26).
For controlling the forward / reverse rotation and the number of revolutions of the vehicle, including a brake shaft (63) having a steering output brake (62), a clutch shaft (65) having a steering output clutch (64), and the left and right ring gears. Left and right input gears (66) and (67) that are always engaged with the external teeth (38b) of (38) are provided, and the brake shaft (6) is mounted on the output shaft (68) of the second hydraulic motor (27).
3) The clutch shaft (65) is connected via the steering output clutch (64), the right input gear (67) is connected to the clutch shaft (65) via the forward gear (69), and the clutch shaft is The left input gear (66) is connected to (65) via a forward rotation gear (69) and a reverse rotation gear (70). The brake (62) is turned on by the neutralization of the sub-transmission sliders (55) and (56), and the clutch (6) is turned on.
4), the brake (62) is turned off and the clutch (64) is turned on at the time of the output of the sub-shift other than the neutral, and the forward gear (69) is applied to the external teeth (38b) of the right ring gear (38). ) Is transmitted to the external gear (38b) of the left ring gear (38) via the forward gear (69) and the reverse gear (70).
7) The rotation is transmitted, and when the second hydraulic motor (27) is rotated forward (reverse rotation), the left ring gear (38) is rotated reversely (forward rotation) and the right ring gear (38) is rotated forward (rotation) at the same left and right rotation speed. (Reverse rotation).

Thus, the second hydraulic motor for turning (27)
When the first hydraulic motor (24) for traveling is driven in a state where the left and right ring gears (38) are stopped and fixed, the rotation output from the first hydraulic motor (24) is The right and left traveling crawlers (2) are transmitted to the sun gear (36) at the same rotation speed, and are driven by the same rotation speed in the left and right same rotation direction via the planetary gear (37) and the carrier (41) of the left and right planetary gear mechanism (35). Then, the vehicle travels straight in the front-rear direction. On the other hand, when the first hydraulic motor (24) for traveling is stopped and the left and right sun gears (36) are stationary and fixed, the second hydraulic motor (27) for turning is driven forward and reverse to rotate the left planetary gear. The gear mechanism (35) rotates forward or backward, and the right planetary gear mechanism (35) rotates reversely or forward, driving the left and right traveling crawlers (2) in the reverse direction, and turning the body left or right. Further, by driving the second hydraulic motor for turning (27) while driving the first hydraulic motor for traveling (24), the body turns right and left and the course is corrected. The turning radius is determined by the output rotation speed of the second hydraulic motor (27).

Further, as shown in FIGS. 2, 4 to 13, a steering column (71) is erected and fixed on the front upper surface of the cab (18).
1) A steering handle (19) is attached to the upper side of the upper surface so as to be rotatable around the vertical axis, a side column (72) is provided on the left side of the cab (18), and a transmission (22) is provided below the side column (72). The main transmission lever (73),
Sub transmission lever (74), reaping clutch lever (75),
Push the threshing clutch lever (76) to the side column (7
Attach to 2). In addition, the steering column (7
1) is formed by molding an aluminum alloy casting,
Multiple bolts (77) with a split structure that can be split left and right
To form a box shape.

A tilt base (78) is formed integrally with the upper part of the steering column (71).
To the tilt bracket (8) via the fulcrum bolt (79).
0) is rotatably supported, and the tilt bracket (80) is fixed by the tilt lever (81) so that the angle can be freely adjusted. A shaft case (8) is attached to the tilt bracket (80).
2) A shaft case (82) is extended above an upper cover (83) for fixing the lower part integrally and fixed to the upper surface of the column (71), and the upper handle shaft (84) is rotatable inside the shaft case (82). The steering handle (19) is fixed at the upper end of the upper handle shaft (84), and the handle (19) is moved and adjusted around the fulcrum bolt (79) by operating the tilt lever (81) to a fixed position. And the handle (19) mounting position is adjusted in the front-rear direction to be fixed at a position where the operator can easily operate.

The upper end of the lower handle shaft (86) is connected to the lower end of the upper handle shaft (84) via a universal joint (85), and the lower handle shaft (86) is mounted on the upper part of the steering column (71). In addition to being rotatably supported, the upper end of the steering input shaft (87) is rotatably supported above the steering column (71), and the gear (88) of the lower handle shaft (86) and the steering input shaft (87). ) Is engaged with each other to connect the shafts (86) and (87), and the steering input shaft (87) is extended vertically at substantially the center of the inside of the steering column (71).

Further, the steering column (71)
A bearing member (90) is detachably fixed to the left and right sides substantially in the middle of the vertical width, and one end of the transmission input shaft (91) is rotatably cantilevered to the bearing member (90) via the bearing (92). The transmission input shaft (91) is supported substantially horizontally in the left-right direction, and the lower end of the steering input shaft (87) is connected to the upper end of the input fulcrum shaft (94) via a universal joint (93). The steering input member (95) is fixed to the fulcrum shaft (94), the steering input member (95) is rotatably mounted on the speed change input shaft (91), and the input connector (95) is connected to the steering input member (95). 96) is detachably fixed, and the link bolt (9
7) connects the steering input member (95) to the input connector (96), and rotatably supports the steering input member (95) to the transmission input shaft (91) via a bearing (95a). Then, the steering input member (95) is moved to the steering input shaft (8).
7) Make it rotatably supported around. The steering input member (95) is rotated forward and reverse around a substantially vertical axis of the input shaft (87) by forward and reverse rotation of the steering input shaft (87).
The input fulcrum shaft (94) and the steering input member (95) are tilted in the front-rear direction around the center line of the substantially horizontal input shaft (91) by forward / reverse rotation of the speed change input shaft (91). The universal joint (93) is attached to the intersection of the center line of the steering input shaft (87) of the steering wheel and the center line of the speed change input shaft (91) in the horizontal direction at right angles, and the steering input shaft (87) of the steering handle (19). By the forward / reverse operation, the steering input member (95) and the input connector (96) are rotated forward / reverse around the center line of the steering input shaft (87).

Further, the steering column (71)
The main transmission shaft (99) is rotatably supported on the lower front side of the
The left end of the main transmission shaft (99), which extends substantially horizontally in the left-right direction, protrudes to the left outside of the steering column (71), and is rotatable on the machine base (3) below the side column (72). A link (101) is attached to the intermediate shaft (100).
(102) and the main transmission shaft (99) is connected via the rod (104) with the length adjustment turnbuckle (103). As shown in FIG. 4, a fulcrum plate (106) is rotatably mounted on the machine base (3) via a lever fulcrum shaft (105), and the main transmission lever is mounted on the fulcrum plate (106) via a cylinder shaft (107). (73) The base is mounted to be swingable in the left-right direction, and the links (108) (109) are connected to the fulcrum plate (106).
The main transmission shaft (99) is rotated forward and backward by a speed change operation of swinging the main transmission lever (73) forward and backward around the lever fulcrum shaft (105) by connecting the intermediate shaft (100) via the. Further, the main transmission shaft (99) is connected to the transmission input shaft (91) via the rod-type main transmission member (110), the upper connecting plate (111) and the lower link (112). The steering input member (95) is tilted back and forth around the center line of the transmission input shaft (91) by a forward / reverse operation of the main transmission shaft (99).

Further, a cylindrical steering output shaft (113) is rotatably mounted on the main transmission shaft (99), and the link steering output member (114) is fixed to the steering output shaft (113). At the same time, the upper end of the rod-shaped steering connection member (115) is connected to the input connector (96) via the universal joint-type steering input connection (116), and the ball-and-joint-type steering output connection ( The lower end of the steering connection member (115) is connected to the steering output member (114) via the steering connection member (117) to constitute a steering mechanism (118) for changing the traveling course.

Further, a speed change output shaft (119) is rotatably supported inside the steering column (71) substantially parallel to the steering output shaft (113) above the steering output shaft (113),
The link type shift output member (120) is connected to the shift output shaft (11).
9) and a rod-shaped speed change coupling member (12).
The upper end of 1) is connected to the input connector (96) via a universal joint type speed change input connection (122), and the speed change coupling member (12) is connected via a ball joint type speed change output connection (123).
The lower end of 1) is connected to a shift output member (120) to change the traveling speed and switch between forward and reverse.
4).

Further, the inner steering operation shaft (125) and the outer speed change operation shaft (12) of the dual shaft structure rotatable with each other.
6) is rotatably mounted on a bearing (127) in the center of the left and right widths at the lower rear side of the steering column (71).
The variable speed output shaft (11) is connected via a ball joint shaft (128) and a variable speed link (129) (130) whose length is adjustable.
9), the upper end of the speed change operation shaft (126) is connected, and the steering output shaft (11) is connected via a ball joint joint shaft (131) whose length can be adjusted and the steering links (132) and (133).
The upper end of the steering operation shaft (125) is connected to 3).

Each of the operating shafts (125) (126)
Are set up on the bottom of the steering column (71) substantially vertically on the same axis, and the upper ends of the operation shafts (125) and (126) are extended inside the steering column (71), and the output shafts (113) ( 119) and each operating shaft (125) (12) below the bottom of the steering column (71).
6) The operation shafts (125) (1) are provided on the lower surface side of the operator's cab (20) on the operator boarding step (134) by projecting the lower end.
26) The transmission member (2
5) The vehicle speed control arm (13) is connected to the output control shaft (135).
6) fixed, adjustable length vehicle speed rod (138) with turnbuckle (137) and vehicle speed link (139)
A vehicle speed control arm (136) is connected to the lower end portion of the speed change operation shaft (126) via a gear. The first hydraulic pump (23) adjusts the swash plate angle by the forward / reverse operation of the output control shaft (135). The rotation speed control and forward / reverse switching of the hydraulic motor (24) are performed to continuously change the traveling speed (vehicle speed) and to switch between forward and backward. Further, a steering control arm (141) is fixed to an output control shaft (140) of the steering member (28),
A steering control arm (141) is connected to the lower end of the steering operation shaft (125) through a length-adjustable swing rod (143) with a turnbuckle (142) and a swing link (144). ), The swash plate angle of the second hydraulic pump (26) is adjusted to control the rotation speed of the second hydraulic motor (27) and to switch between forward and reverse rotations. Switching between left and right turning directions is performed.

Further, the steering column (71)
An accelerator lever (145) is provided on the outer surface on the right side of the engine so as to be rotatable in the front-rear direction.
An accelerator wire (146) for connecting the engine (2) is extended from below along the inside of the front surface of the steering column (71), and the engine (2) is operated by an accelerator lever (145).
1) The number of revolutions is manually adjusted, a maintenance window (147) is opened on the rear surface of the steering column (71), and the maintenance window (147) is closed by a removable lid (148).

As is apparent from the above, the transmission mechanism (12
4) The steering mechanism (118) changes the steering amount in proportion to the operation amount. The steering amount is automatically enlarged by the high-speed running shift, and the steering amount is automatically reduced by the low-speed running shift. With a certain amount of operation of the steering handle (19), the turning radius of the left and right traveling crawlers (2) is maintained substantially constant irrespective of the traveling speed, thereby changing the traveling speed of the agricultural work and making the aircraft follow the crop line. In addition to making corrections, a reverse conical transmission mechanism (124) and a steering mechanism (118) are formed, and the steering input shaft (87) is rotated by the steering operation to connect the steering input member (95). For example, an operation of reducing the traveling speed while turning is performed, and a speed change input shaft (91) is rotated by a speed change operation to operate a steering input member (95), thereby enlarging or reducing the turning radius due to the running speed change. Few rows To perform operations such as discontinuation of turning output by the running gear neutral.

Further, a steering input connecting portion (116) for connecting the steering input member (95) and the steering connecting member (115) is disposed on the center line of the transmission input shaft (91), and the transmission input member (96) is provided. ) And the speed change coupling member (121) are arranged on a straight line (A) intersecting the core of the speed change input shaft (91), and the steering input shaft (87) and the speed change input are arranged. Steering input member (95) about axis (91)
The relative motion of the gears can be easily set, the design and assembly and structure can be simplified, the operation reliability can be improved, and the axis of the transmission input shaft (91) and the axis of the steering input shaft (87) intersect. The speed change input connecting portion (122) and the steering input connecting portion (116) are arranged on the circumference (C) centered on the center intersection (B), and the structure of the steering input member (95) and the like is simplified. A speed change output connecting portion (123) for connecting the speed change output member (120) and the speed change coupling member (121), and a steering output member (11).
A steering output connecting portion (117) for connecting the steering coupling member (115) with the steering output coupling member (115) is disposed on the core wire of the steering input shaft (87) to perform reverse handle development by shifting between forward and reverse. The shift output member (120) and the steering output member (1)
14) Design, assembly and structure are simplified, operation reliability is improved, etc., and the transmission output connecting portion (123) is connected to the axis (B) of the transmission input shaft (91) and the steering input shaft (87). ) Is different from the distance of the steering output connecting portion (117), and the transmission output connecting portion (123) and the steering output connecting portion (117) are separated from each other on the same straight line (D). (117) The interference prevention and the setting of the movement range of (123) can be easily performed, and the speed change coupling member (12
1) and the steering connection member (115) are configured to be installed in a small place.

Further, the speed change input connecting portion (116) and the steering input connecting portion (122) are formed by a circle centered on the intersection (B) between the speed change input shaft (91) and the steering input shaft (87). Zhou (C)
The traveling speed change is performed by keeping the steering input connection (116) at a constant position by rotating the speed change input shaft (91) and maximizing the displacement of the speed change input connection (122). And each of the input connection sections (116)
The structure in which the speed change input shaft (91) is arranged on the plane on which the (122) is moved easily ensures the amount of movement of each connecting portion (116) (122), and is compact and functionally the steering input member (95). The shift input connecting portion (122) and the steering input connecting portion (116) are moved within a range of about 90 degrees around the steering input shaft (87), and the reverse steering development by forward / reverse switching is performed. Prevention and each input connection (116)
In addition to securing the movement amount of (122), the steering input shaft (87)
Transmission input connecting portion (12
2) In the decelerating direction, the operation is easily performed, and the spin turn operation for changing the direction around the traveling crawler (2) inside the turning is easily performed, and the device is functionally configured with a compact structure. Further, the spin turn operation is performed by the steering member (2).
8) An operation of rotating one of the left and right traveling crawlers (2) in the forward direction and the other in the reverse direction via the differential mechanism (33) by the output of the differential mechanism (33), thereby turning the left and right traveling crawlers (2) forward and backward and around the left and right center points. The forward and backward traveling and turning are performed simultaneously, and the turning radius is determined by the ratio of the rotation of the transmission member (25), which is the forward and backward output, and the rotation of the steering member (28), which is the turning output. Further, a transmission output shaft (119) and a steering output shaft (113) are provided substantially parallel to the transmission input shaft (91), and the output shafts (113) and (119) form a case that can be divided into a plurality of columns. (71) and the transmission input shaft (91) and the output shafts (113) and (119) are extended in the left-right direction, so that the connecting structure in the longitudinal direction of the fuselage can be easily obtained. The connection between the main transmission lever (73) and the transmission input shaft (91), the transmission member (25) and the steering member (28) and the output shaft (11).
3) It is configured so that the connection with (119) can be easily performed, and the operation structure can be simplified and the handling property can be improved.

Further, as shown in FIG. 14, a phase adjusting slot (149) through which the connecting bolt (97) is loosely inserted is opened in the input connector (96), and the core of the steering input shaft (87) is connected to the input connector (96). The slot (14) is placed on the same circumference as the center.
9) is formed, and the steering input member (9) is fixed in a state in which the shift input shaft (91) is fixed to the traveling shift neutral position by engagement of the bolt-shaped reference setting member (98) and the neutral setting hole (150).
5) is rotated only right and left with respect to the speed change input shaft (91) to correct the relative position of the steering input member (95), and the turning neutral determined by the operation of the steering handle (19). Set a neutral position and running speed. Further, a reference setting member (98) for fixing the shift input shaft (91) at the reference position is provided so as to be freely detachable, the bolted body (98a) shown in FIG. 14 is removed, and the reference setting member (98) as shown in FIG. ) The tip is engaged with the neutral setting hole (150), and the neutral position of the traveling speed change and the steering straight-forward position are set to the neutral setting hole (15).
0) and the reference setting member (98), the joint nut (121a) (1) shown in FIGS.
By the screw-in / out operation of 15a), the speed change coupling member (121)
Alternatively, an adjustment at the time of assembling such that the connecting length of the steering coupling member (115) or the like is expanded or contracted is performed to improve the assembling workability.

Further, as shown in FIGS. 16 to 18, the gear (88) has a plurality of teeth (1) in an outer peripheral range of 270 degrees.
51) is formed, an outer peripheral range of 90 degrees is formed in an arc (152), the total rotation angle of the steering handle (19) is set to 270 degrees, and the angle of left steering rotation or right steering rotation is set to 135 degrees. The steering wheel (19) is set so that the operator can easily perform the rotation operation with one hand. Further, the sector gear (89) has a plurality of teeth (153) in an outer peripheral range of 130 degrees.
Is formed on the circular cam (154), and the teeth (151) of the gear (88) and the teeth (153) of the sector gear (89) are engaged with each other to form the gears (88) (8).
At the time of the maximum forward / reverse rotation of 9), the stoppers (155) at both ends of the arc (152) and the stoppers (156) at both ends of the arc cam (154) are brought into contact with each other to regulate the rotation of the steering handle (19). The steering input member (95) and the input connector (96) are rotated forward or backward in the range of 65 degrees around the center line of the steering input shaft (87), so that the steering input member (95) is rotated and moved on a plane. The speed change input shaft (91) and the main speed change member (1
10) A structure in which a space for arranging the upper end portion is secured, and the steering input connecting portion (116) is provided on the core line of the transmission input shaft (91), and the input connecting portions (116) on the same circumference.
(122) can be easily obtained at a 90-degree distance, and the structure can be made compact, and the design and assembly can be simplified.

A straight notch (157) is formed at the center of the arc cam (154) of the sector gear (89), and a detent shaft (158) is rotatably supported on the upper surface wall of the steering column (71). Detent axis (15
8) A detent arm (159) is fixed to the lower end, a detent roller (161) is rotatably supported on the detent arm (159) via a roller shaft (160), and the detent roller (161) is attached to the arc cam (154). The detent roller (161) is removably engaged with the straight notch (157), and the steering handle (19) is supported at the straight position. Further, a detent lever (162) is fixed to the upper end side of the detent shaft (158), and one end of a neutral spring (163) wound around the detent shaft (158) is locked to the detent lever (162), and the steering column (162) is fixed. The other end of the neutral spring (163) is brought into contact with the receiving plate (164) of (71), and the detent roller (161) is attached to the circular cam (154) and the linear notch (157) by the neutral spring (1).
63). Further, a microswitch-type straight-ahead sensor (165) for electrically detecting the straight-ahead position of the steering handle (19) by switching on and off is attached to the detent lever (162).

Further, as shown in FIGS. 12 and 13, a telescopic damper (166) is provided at an intermediate portion of the revolving rod (143), and a spring case (167) fixed to one rod (143) end is provided. Spring seats (168) and (169) that are slidably locked to the other rod (143) end.
And a compression spring (170) that is wound around the rod (143) in a compressed state via spring seats (168) and (169) in the damper (166), and is provided by a steering operation of a steering handle (19). When a certain pushing force is applied to the rod (143) in both the pushing direction and the pulling direction,
When the steering control arm (141) is moved to the maximum output position by operating the steering angle (116%) (85%) of the steering handle (19), the spring (170) compresses to expand and contract the rod (143). Then, the steering handle (19) is further rotated in the turning direction while the second hydraulic pump (26) is maintained at the maximum output, and the steering handle (19) is operated from the turning angle of 116 degrees to the turning angle of 135 degrees. It is composed.

Further, as shown in FIGS. 12, 19 and 20, a pin (171) is fixed to the vehicle speed control arm (136), and a slot (172) through which the pin (171) is slidably inserted. ) Is formed at the end of the vehicle speed rod (138), and the vehicle speed rod (138) is connected to the vehicle speed control arm (136).
To the vehicle via a long hole (172) and a pin (171), a detent cam (173) is fixed coaxially with the vehicle speed control arm (136), and a detent roller (174) is spring-connected to the cam (173). 175), the vehicle speed control arm (136) is automatically returned to the neutral position by the cam (173) and the roller (174), and the first hydraulic motor (24) is neutralized by the neutral support of the arm (136). And the arm (13)
6) is neutral and the main transmission lever (73) is in the neutral operation position, and the pin (1) is located substantially at the center of the long hole (172) in the longitudinal direction.
71), and the stroke of the pin (17) is substantially equal to both forward and backward shifts by pushing and pulling the rod (138).
1), the arm (136) is configured to perform a substantially symmetrical (forward / reverse) operation in both forward and backward shifts.

Then, as shown in FIG. 20, by shifting the main shift lever (73) in the neutral position (O) to move the dead zone (P) to the shift start position (Q), The pin (171) comes into contact with the longitudinal end of the long hole (172) by pushing and pulling the vehicle speed rod (138), and the main speed change lever (73) and the vehicle speed control arm (136)
And the main transmission lever (73) is further shifted to move the shift zone (R) to shift the transmission member (2).
5) The vehicle speed control arm (136) in the neutral position (T) by tilting and supporting it up to the maximum output position (S).
Is moved to the shift zone (R) up to the maximum output position (S) in proportion to the amount of operation of the main shift lever (73), and the first hydraulic motor (24) of the shift member (25) is steplessly output. The left and right traveling crawlers (2) are driven at the same speed in the same direction to move forward and backward.

Further, as shown in FIGS. 14, 21 and 22, a notch (176) is provided in the bearing portion (90) to form a concave portion (177), and the steering handle (19) is turned to the maximum left turning position. When the angle (135 degrees) is operated, the shift input connecting portion (1
22) and the speed change coupling member (121) with the concave portion (17).
7), and the connecting portion (122) is inserted into the bearing portion (9).
As compared with the structure that abuts the steering wheel (19), the maximum vehicle speed deceleration rate when the steering wheel (19) is turned left and right is made larger. A constant speed zone (V) is formed before the bolt (97) comes into contact with the edge of the phase adjustment hole (149), and the center speed of the body is reduced by a steering operation of the steering handle (19) within a turning angle of 15 degrees. Correct the course while keeping it approximately constant. Further, the steering handle (19) is further steered to move the turning zone (W) to move the steering handle (19) to the maximum output position (X) of the steering member (28). To move the steering control arm (141) up to the maximum output position (X) in proportion to the rotation angle of the steering handle (19), and the second hydraulic motor of the steering member (28). (27) steplessly outputs a speed change to change the speed difference between the left and right traveling crawlers (2) steplessly, and sets the vehicle speed rod (1) in proportion to the rotation angle of the steering handle (19).
38) and the vehicle speed control arm (136) are moved back in the neutral direction of shifting, the traveling speed of the left and right traveling crawlers (2) is steplessly reduced, and the turning angle is increased by increasing the steering angle of the steering handle (19). Becomes smaller, the traveling speed becomes slower, and a left-right turning operation is performed. Further, the steering wheel (19) having a turning angle of 116 degrees is further steered to rotate the inside of the spin turn zone (Y) to the maximum steering position (Z) having a turning angle of 135 degrees, thereby providing a damper. Swivel rod (143) by the expansion and contraction absorption operation of (166) (connection length)
While the steering control arm (141) is maintained at the maximum output position (X), the vehicle speed rod (138) and the vehicle speed control arm (136) are further moved back in the neutral direction of the speed change, and the left and right traveling crawlers ( It is configured to perform a spin-turn operation of turning around a turning center formed in the middle of the left and right widths of 2).

As shown in FIGS. 19, 20 and 22,
The vehicle speed rod (138) and the vehicle speed control arm (136) are connected by a long hole (172), and the main speed change lever (73) is connected.
Is formed larger than the actual speed change stroke, and a concave portion (177) is formed in the bearing (90) provided in the left turning direction of the speed change input connecting portion (122) to form the connecting portion (122). ) Into and out of the recess (177) to set the vehicle speed reduction rate to 25% at the maximum steering angle (135 degrees) of the steering handle (19) at the time of the maximum output operation of the main transmission lever (73). While the deceleration rate was reduced to 40%, the deceleration rate was further increased and decelerated to 25%, a spin-turn operation was performed, and the aircraft was turned around 180 degrees at the field headland, and the next uncut kernel It is configured to move to the culm cutting process. As shown in FIG. 22, the main shift lever (7
3) At the maximum output, when the damper (166) operates at the steering angle (116) of the steering handle (19) to maintain the maximum output of the steering member (28), the steering angle (116) of the steering handle (19) is maintained.
The deceleration rate of the left and right traveling crawlers (2) is maintained substantially equal in the range of degrees to 135 degrees, and the speed difference between the left and right traveling crawlers (2) becomes maximum at the position of the turning angle of the steering handle (19) of 116 degrees. The speed difference between the left and right traveling crawlers (2) is maintained substantially constant in the range of the steering angle of the steering handle (19) from 116 degrees to 135 degrees, and the traveling speed is reduced in proportion to the steering angle of the handle (19). You.

The amount of deceleration of the vehicle speed control arm (136) by the steering handle (19) is increased to increase the deceleration rate, and the deceleration rate required for the spin turn operation can be easily obtained. The vehicle speed control arm (136) and the vehicle speed rod (13)
8) is connected to the long hole (172) by the pin (171), and the amount of operation of the vehicle speed rod (138) or the amount of deceleration of the vehicle speed control arm (136) depends on the size of the long hole (172) and the pin (171). And the like, the output characteristics of the speed change member (25) and the steering member (28), the deceleration control operation of the steering handle (19), etc. can be easily considered, and the mounting structure of the vehicle speed rod (138) can be simplified. It is designed to improve handling, such as integration and assembly work, and to reduce manufacturing costs.

Further, the input member (95) is operated by operating the dead zone (P) of the main shift lever (73).
(96) is shifted from the neutral position (P) to the shift start position (Q) around the shift input shaft (91), and the steering handle (1) is shifted.
9) In the constant speed zone (V) centered on the straight traveling position, the operating ratio of the steering control arm (141) to the steering angle of the steering wheel (19) is increased, and the main shift lever (73) is shifted to the shift zone (R). When the vehicle is moved at a very low speed, the operation amount of the steering control arm (141) is increased by operating the steering handle (19) in the constant speed zone (V), and the steering amount of the steering member (28) is increased. 2 Handle the rotation change rate of the hydraulic pump (26) with the handle (19)
The turning operation time at the very low speed output of the second hydraulic pump (26) is reduced by increasing the turning angle, and the motor (2
7) Prevents the turning operation from being performed in the low-speed output range, and sets the main shift lever (73) to the steering handle (1) in the low-speed running state.
The turning operation according to 9) is performed by increasing the output of the second hydraulic pump (26) by a certain amount or more. As described above, by preventing the turning operation of the second hydraulic pump (26) at the low-speed rotation output, even if the second hydraulic pump (26) has low efficiency in the low-speed output range, the second hydraulic pump (26) , The turning operation can be performed while securing a certain output or more. Further, after the control of the steering member (28) by the steering handle (19) is started by securing the turning force of a certain level or more by the shifting operation of the main shift lever (73), the traveling shift operation is performed. Is started later, it is possible to prevent a shortage of the turning force of the steering member (28) during the low-speed movement, and the steering member (2)
8) to reduce the manufacturing cost and to improve the turning performance of the left and right traveling crawlers (2). By operating the main shift lever (73), the steering and shift input members (about the center line of the shift input shaft (91) are changed). After rotating the input members (95) and (96) by a fixed angle, the input members (95) and (96) are
5), the transmission member (25) is operated, and the input members (95) and (96) are moved to a steering operation state by a shift operation, and then output from the transmission member (25) to output the traveling crawler (25). Since 2) is driven, even when the vehicle travels at a low speed with a small running output, the necessary amount of turning force is secured by increasing the control amount of the steering member (28) by the steering operation of the steering handle (19), and the vehicle moves at a low speed. It is configured to improve the turning performance at the time.

When the main shift lever (73) is in the neutral position, the forward (reverse) operation of the steering handle (19) causes each of the input members (9) to rotate around the axis of the steering input shaft (87).
5) (96) and the coupling members (115) (121) move on a conical trajectory, and the output members (114) (12)
0) and the state in which the output shafts (113) and (119) are stopped. Further, the forward (reverse) operation of tilting the main transmission lever (73) forward (rearward) causes the input members (95) and (96) to tilt forward (rearward) around the center line of the transmission input shaft (91), and to operate. While maintaining the state where the direction input connecting portion (116) is stopped at a fixed position, the speed change input connecting portion (12
2) is moved upward (downward) and the transmission output member (12
0) Upward (downward) swing of the transmission output shaft (119)
Of the first hydraulic motor (2) by switching the swash plate angle of the first hydraulic pump (23) of the transmission member (23).
4) is rotated forward (reverse), and the left and right traveling crawlers (2) are driven forward (reverse) by forward (reverse) rotation of the output shaft (31) of the first hydraulic motor (24). Further, the rotation speed of the output shaft (31) changes in proportion to the tilt angle of the main transmission lever (73), and the forward (reverse) speed of the traveling crawler (2) is continuously changed.

Further, when the main shift lever (73) is tilted forward (rearward) to perform a forward (reverse) operation,
By rotating the steering handle (19) leftward (rightward), the steering input member (95) is tilted forward (rearward) around the center line of the transmission input shaft (91). 87) Forward rotation (reverse rotation) around the core line, the steering input connecting portion (116) moves downward (upward), and the steering output member (1
14), the steering output shaft (11
3) is rotated forward (reverse rotation), the second hydraulic motor (27) is rotated forward (reverse rotation) by switching the swash plate angle of the second hydraulic pump (26) of the steering member (28), and the second hydraulic motor ( 27)
Forward (reverse) rotation of the output shaft (68), the left traveling crawler (2) is decelerated (increased), and the right traveling crawler (2) is accelerated (decelerated) to the left (right). Turn the aircraft and correct the course to the left (right). Also,
Simultaneously with the course correction operation, by turning the steering handle (19) to the left (rightward), the shift input member (96) is steered forward (rearward) around the center line of the shift input shaft (91). The input shaft (87) rotates forward (reverse) around the center line, the shift input connecting portion (122) moves downward (upward), and the shift output member (120) swings down (upward) to output the shift output shaft ( 119) is rotated in the reverse direction (forward rotation), and the speed change member (25) is rotated.
Is returned to the neutral direction to reduce the rotation speed of the output shaft (31) and reduce the traveling speed (vehicle speed). As described above, by the left and right steering operation of the steering handle (19) during the traveling movement, in proportion to the rotation angle of the steering handle (19),
The turning radius (angle) for correcting the course and the deceleration amount of the traveling speed change, and when the steering wheel (19) is rotated greatly, the speed difference between the left and right traveling crawlers (2) is increased to reduce the turning radius. At the same time, the amount of deceleration of the traveling speed increases and the vehicle speed decreases, and at the time of forward movement and reverse movement, the movement of the turning input connecting portion (116) is reversed with respect to the rotation of the steering handle (19), In either case, the turning operation direction of the steering handle (19) and the turning direction of the fuselage are made to coincide with each other, and the turning operation of the circular steering handle (19) for turning operation is performed by, for example, a tractor or a rice transplanter. It performs course correction and direction change with the same driving feeling as a wheeled vehicle.

FIG. 22 shows the relationship between the turning angle of the steering handle (19) and the speed of the left and right traveling crawlers (2) when the body turns right and left. The turning angle of the handle (19) becomes large. The difference between the speeds of the left and right traveling crawlers (2) becomes larger, and the body center speed, which is the average speed of the left and right traveling crawlers (2), also depends on the traveling speed (high speed / standard speed / low speed) of the auxiliary transmission lever (74). Slow down. Move the steering handle (19) in the straight-ahead position to the left (right) about 15
In the reaping course correction range in which the gears are rotated by degrees, the speed change input connecting portion (122) moves in a substantially tangential direction with respect to the rotation of the steering input member (95), and the speed change output member (120) is maintained at substantially the same position as the straight running. And the second of the steering member (28)
Leftward (rightward) by steering output that causes the second hydraulic motor (27) to rotate forward (reverse) by the hydraulic pump (26)
Turn to adjust the course to match the curvature of the uncut culm (crop) row. At this time, the traveling crawler inside the turn (2)
Is substantially equal to the speed increase amount of the traveling crawler (2) on the outside of the turn, and the center speed of the body is maintained at substantially the same speed as the straight traveling. Also, the steering handle (19) is moved 15 degrees from the straight traveling position.
When the gear is rotated by more than degrees, the speed change coupling member (121) is pushed and pulled by the rotation of the steering input member (95), and the speed change output member (120) is decelerated in both left and right turns. The traveling speed output of the hydraulic pump (23) and the motor (24) is reduced, and the left and right traveling crawlers (2) (2)
Are driven in the same direction to advance (or reverse),
The left and right traveling crawlers (2) perform a brake turn operation to turn leftward (rightward) due to a traveling speed difference between the two (2),
Make a course correction to return to the original row or move to the next row when it comes off the uncut culm (crop) row. Further, when the steering handle (19) is rotated about 116 degrees, the damper (1) is rotated.
66) is operated to maintain the maximum swing output, and 135
The center speed of the body is reduced to about one-fourth of the straight traveling speed in the range of the turning angle in degrees, and the traveling crawler (2) inside the turning is driven to rotate in reverse, so that the aircraft moves around the turning center between the left and right traveling crawlers (2). A rotating spin turn operation is performed, and the aircraft is shifted 180 degrees in the turning direction by the left and right widths of the left and right traveling crawlers (2).
The steering wheel (19) is rotated in the range of 0 to 135 degrees to perform a left or right turning operation, and 15 degrees to the left and right around the straight traveling position. Of the handle (19) in the range of rotation, along the row of uncut stalks (crops), while correcting the alignment path while maintaining the traveling speed at the time of straight traveling, and the handle (19) of the left and right of 116 degrees to 135 degrees. ) By rotating, while maintaining the maximum output of the turning member (28), the spin-turn operation of turning the body on the field headland and moving to the next work step is performed at a traveling speed of about one-fourth of that when traveling straight ( The deceleration is automatically reduced to 25%).

When the sub-shift is maintained at the standard speed (1.5 meters per second) and the steering handle (19) is rotated by 90 degrees, the main shift lever (68) is operated to increase the main shift output to a high speed and 3 minutes. Even if it is changed to one-third and one-third, only the turning speed (body center speed) is changed while the turning radius of the aircraft is kept substantially constant. Further, the first hydraulic pump (23) and the first hydraulic motor (2) are set within the setting range of the link bolt (97) and the phase adjusting hole (149) based on the straight traveling position.
4) is maintained in a straight-ahead state, and even if a steering operation is performed along the crop line or ridge during agricultural work, the running speed is prevented from changing non-uniformly, and the running speed is kept substantially the same. It is possible to correct the course during the agricultural work, and to perform a proper steering operation by making the driving feeling of the operator substantially coincide with the traveling operation of the machine. The sub-transmission lever (74) for switching the transmission reference value of the main transmission lever (73) changes the turning radius from a small diameter to a large diameter in proportion to the low-speed, standard and high-speed switching of the sub-transmission operation. 23) and a reduction ratio between the motor (24) and the traveling crawler (2) and a reduction ratio between the second hydraulic pump (26) and the motor (27) and the traveling crawler (2), or a spin turn operation. The driving speed required for turning at a small radius is ensured while operating the main shift lever (73) at the same sub-shift operation position to change the running speed during turning while keeping the turning radius substantially constant. Let it.

Further, as shown in FIGS. 11, 23, and 24, a cylindrical deceleration output shaft (1) is connected to the speed change output shaft (119).
78) and the directly connected output shaft (179) are rotatably supported,
A speed change output member (120) is fixed to the speed reduction output shaft (178), a speed change link (129) is fixed to the speed change output shaft (119) via a boss (180), and the speed change output shaft (119) is fixed to the main speed change shaft (99). The direct input link (182) is fixed via the boss (181), the direct output link (183) is fixed to the direct output shaft (179), and the input link (1) is fixed.
The roller (185) provided on the shaft (184) of the (82) is slidably fitted into the long hole (186) of the output link (183), and the main transmission shaft (99) is connected via each link (182) (183). The output shaft (179) is directly connected to the
9) Rotate (179) in conjunction.

Further, a clutch shaft (187) is inserted into the hollow of the transmission output shaft (119) so as to be able to move in and out, and a clutch pin (188) to be engaged with the transmission output shaft (119) is inserted into the clutch shaft (187) insertion end. Notches (189) and (190) are formed on the deceleration output shaft (178) and the directly-coupled output shaft (179), respectively. 18
7) Either one of the deceleration output shaft (178) or the directly-coupled output shaft (179) is selectively connected to the speed change output shaft (119) via the clutch pin (188) and the notch (189) (190) by the access operation. Connect. The spring (19)
Positioning grooves (193) and (194) for removably engaging the positioning ball (192) according to 1) are provided on the clutch shaft (187), and any one of the ball (192) and each groove (193) (194) is provided. Each notch (189) (19) of each output shaft (178) (179)
0), the clutch pin (188) is kept engaged, and a feeling lever (195) is attached to the outside of the steering column (71) so that the operator on the step (134) can operate it. (195) is connected to the clutch shaft (187), and the lever (19
5) The clutch shaft (187) is switched by the operation, and the shift input from the shift output member (120) and the output link (18).
3) The shift link (1)
29) is operated to reduce the vehicle speed in proportion to the amount of operation of the steering wheel (19), or the speed change input based on the amount of operation of the main shift lever (73).
The speed change control of the speed change member (25) is performed.

As is apparent from the above, the shift operation output from the main shift lever (73) is divided into two by the main shift shaft (99), and one output is set as a vehicle speed reduction output according to the angle of the steering wheel (19). The output member (120) is transmitted to the transmission link (129) via the deceleration output shaft (178) on the transmission output shaft (119), and the other output is output to the output link (1).
83) to the direct output shaft (17) on the transmission output shaft (119).
9) through a transmission link (129) to select the two transmission outputs on the transmission output shaft (119) and control the transmission of the first hydraulic pump (23) by one of the two transmission outputs. The driving force is transmitted to the left and right traveling crawlers (2) via a speed change member (25) capable of changing the traveling speed steplessly by operating a main transmission lever (73) as a transmission lever, and a steering handle (19) is used. In a mobile agricultural machine in which a difference in drive speed between left and right traveling crawlers (2) is steplessly changed by operating a steering member (28), a cooperative operation to reduce a vehicle speed in proportion to an operation amount of a steering handle (19). A transmission member (25) is connected to the main transmission lever (73) via a deceleration output shaft (178) which is a system path, and a direct connection output shaft (a third system path separate from the deceleration output shaft (178)). 179) Main speed change Shifting the bar (73) member (2
5), and the deceleration output shaft (178) and the directly-coupled output shaft (179) are selectively used.
The turning performance and the running performance are changed without changing the control structure of 5), and a turning characteristic such as an insensitive turning feeling or an agile turning feeling is selected.

Further, a feeling lever (195) as a feeling switching member for selecting a speed reduction input from the speed reduction output shaft (178) and a speed change operation input from another directly connected output shaft (179) is provided. Switching between the speed change control using (178) and the speed change control using the direct-coupled output shaft (179) is performed by operating the feeling lever (195) to improve the steering function, simplify the handling operation, and reduce the speed. The deceleration input from the output shaft (178) and the speed change operation input from another directly connected output shaft (179) are selected on the same axis, and the speed change member (25) is controlled by one of the inputs, and the main speed change lever ( 73), the connecting mechanism between the steering handle (19) and the speed change member (25) is simplified and downsized to improve workability such as assembly and adjustment.

Further, as shown in FIGS. 25, 26 and 27, there is provided an electric transmission motor (196) which can be switched by manual operation of the main transmission lever (73).
3) to operate the transmission motor (196) to
The swash plate angle of the hydraulic pump (23) is changed, the rotation speed of the output shaft (31) of the first hydraulic motor (24) is steplessly changed, or a forward / reverse switching operation of reverse rotation is performed. The number of revolutions of the first hydraulic motor (24) is changed in proportion to the amount of operation of (73), and the electric steering motor (197) switched by manual operation of the steering handle (19); ), And a steering valve cylinder (199) connected to the valve (198) and a steering valve (198), which is operated by the neutral shift of the auxiliary transmission mechanism (32) and the auxiliary transmission mechanism (32), and operates the steering handle (19). Then, the steering motor (197) is operated to change the swash plate angle of the second hydraulic pump (26).
The output rotation speed of the hydraulic motor (27) is steplessly changed, or a left-right steering operation for reverse rotation is performed, and the traveling direction is changed left and right to change the direction at the headland or correct the course. The number of rotations of the steering motor (27) is changed in proportion to the amount of operation of the steering handle (19), and the straight steering operation of the steering handle (19) and the auxiliary transmission mechanism (32).
The straight-ahead valve (198) is automatically switched by the neutral operation, the steering clutch cylinder (199) is operated, the steering output clutch (62) is disengaged, and the output of the second hydraulic motor (27) is stopped. The steering drive is stopped.

Further, one end of a steering output arm (220) is fixed to the steering input shaft (87), and a steering handle (1) is provided.
9) A pair of left and right rectilinear springs (221) for returning to the rectilinear position
(221) and a return resistance absorber (222) for reducing the rotation speed of the steering handle (19) against the spring (221) are connected to the output arm (220);
When the operator releases the hand from the handle (19) when the manual operation of rotating the steering handle (19) to the left or right is performed, the handle (19) is automatically returned to the straight traveling position gently, and The steering (19) straight-back operation is omitted, and a slide potentiometer type steering angle sensor (223) is connected to the output arm (220).
A potentiometer type main transmission for detecting a steering operation amount of a steering handle (19) by a steering angle sensor (223) and detecting a shift operation position, a neutral position, and a forward / reverse switching operation of the main shift lever (73). Sensor (22
4), a potentiometer type auxiliary shift sensor (225) for detecting the shift operation position and the neutral position of the auxiliary shift lever (74), and an image of the upper surface of the steering column (71) to be switched by an operator in the driver's seat (20). Hand operation member (22
6) the volume type turning feeling setting device (227) for changing the reduction ratio of the vehicle speed with respect to the increase in the steering angle of the steering handle (19);
5) is input connected to a shift steering controller (228) formed by a microcomputer.

Further, a speed increasing and reducing circuit (229) (23) for rotating the speed change motor (196) forward or reverse.
0) is connected to the controller (228) to change the swash plate angle of the first hydraulic pump (23) by the transmission motor (196) in substantially direct proportion to the operation amount (operation angle) of the main transmission lever (73). To obtain a vehicle speed corresponding to the tilting operation of the main shift lever (73), and at the same time, the steering motor (19).
7) Left / right turning circuit (231) for rotating forward or reverse
(232) to said controller (228),
The second hydraulic pump (2) driven by the steering motor (197) changes the steering operation amount (left-right rotation angle) of the steering handle (19).
6) The swash plate is changed in substantially direct proportion, and as shown in the turning output diagram of FIG. 28, the left and right sides of the steering handle (19) are changed between the forward operation and the reverse operation of the main shift lever (73). The right and left turning output is reversed with respect to the rotation to prevent the steering wheel from being reversed when the vehicle is moving forward and when the vehicle is moving backward, and the vehicle is moved forward and backward by performing the same steering operation as the four-wheeled vehicle. In addition, the main shift lever (7
When 3) is neutral, the swash plate angle of the second hydraulic pump (26) is kept at zero, the output of the second hydraulic motor (27) is stopped, and the handle (19) is operated under the neutral state of the main shift. And the absolute value of the swash plate angle of the second hydraulic pump (26), which increases with the steering angle of the steering handle (19), is proportional to the absolute value of the operation angle of the main shift lever (73). The turning radius is kept constant even if the vehicle speed is changed when the steering angle of the steering wheel (19) is constant,
The vehicle turns with the same steering motion as a four-wheeled vehicle. Further, by switching the straight traveling valve (234), the steering clutch cylinder (19
A straight-ahead circuit (233) for operating 9) is connected to the controller (228), and the steering output is automatically stopped when the sub-shift is neutral or the handle (19) goes straight.

Further, as shown in the vehicle speed output diagrams of FIGS. 29 and 30, as the steering angle of the steering handle (19) increases, the vehicle speed determined by the shift position of the main shift lever (73) is reduced. Then, while keeping the main speed change lever (73) in a fixed position, the speed is reduced in proportion to the steering angle of the handle (19), and the lever (7) is simply returned by moving the handle (19) straight.
3) The speed automatically returns to the speed, and the speed of the handle (19) is reduced to the spin turn speed at the maximum turning angle, and the lever (73) is driven by a dead zone (about a 15-degree rotation angle) centered on the straight traveling of the handle (19). Even if the steering speed is maintained and the steering operation is performed for alignment (path correction) to follow the uncut culm row during the harvesting operation, the traveling speed is reduced or increased, and the traveling speed during the harvesting operation is increased. Is prevented from changing non-uniformly, a proper steering operation is performed without causing a shift between the driving sensation of the operator and the traveling operation of the combine, and the operator using the hand operation member (226) is used. As shown in FIG. 30, the manual switching of the member (22) controls the reduction of the reduction ratio so as to achieve sharp turning, normal turning, and smooth turning.
6) Manual operation is performed to obtain turning performance adapted to the work content, field conditions, crop conditions, and the like.

Further, as shown in the turning output diagram of FIG. 31, a steering angle sensor (2) is provided in response to an input of a main shift sensor (224) for detecting an operation angle of the main shift lever (73).
The control output of the steering motor (197) output from the controller (228) is changed to a quadratic curve based on the control of the second hydraulic pump (26) having a low volumetric efficiency. Even if the steering handle (19) is slightly turned, the swash plate changes greatly, and the second hydraulic pump (2
6) and the characteristics of the hydraulic motor (27) are electrically corrected, and the turning of the second hydraulic pump (26) is controlled by the steering motor (197) sensitively even at a low vehicle speed, and the main shift lever (73). The turning radius of the traveling crawler (2) is kept substantially the same with the turning angle of the steering handle (19) in the entire range of the shift, and the steering is performed when the speed of the main shift lever (73) is lower than when the speed is high. The ratio of the control amount of the second hydraulic pump (26) to the operation amount of the steering wheel (19) is increased, and even when the vehicle speed is low in a low speed range where the output of the second hydraulic pump (26) is low, the steering handle ( The small amount operation of 19) causes an appropriate turning operation to be performed, thereby improving the steering operability and the steering function to match the operation amount of the steering handle (19) with the turning radius of the traveling crawler (2). Shift lever (7
3) Neutral is detected by the main speed change sensor (224) to maintain the second hydraulic pump (26) in neutral, and to prevent turning operation of the traveling crawler (2) at the time of stopping, to improve turning performance in a low speed range. The operability of the steering handle (19) is improved, and the driving operation is simplified.

Further, as shown in the turning output diagram of FIG. 32, in response to the input of the steering angle sensor (223) for detecting the turning angle of the steering handle (19), the turning of the handle (19) is performed based on the straight traveling position. Small angle (range of about 0-10 degrees)
Sometimes, the control output of the steering motor (197) output from the controller (228) is greatly changed, and the steering wheel (1
9) The steering motor (19) output from the controller (228) when the turning angle is large (in the range of about 10 to 70 degrees).
7) The control output is changed slightly, and the second hydraulic pump (2
6) and the characteristics of the motor (27) are electrically corrected to make the control of the steering motor (197) sensitive to the operation of the steering wheel (19) when the steering angle is small, and the efficiency is reduced in a low output range. The turning of the traveling crawler (2) by the second hydraulic pump (26) and the motor (27) is performed promptly. When the turning angle of the steering handle (19) is small, the change of the steering control output is increased, It is intended to improve the steering performance during straight running during farm work by making small course corrections such as alignment that matches the running course to the ridge or crop row, and correct the course during straight running work properly. Steering handle (19)
This prevents excessive correction of the course due to erroneous operation of the steering wheel, stably changes the direction at high speed running, and makes the control output of the second hydraulic pump (26) nonlinear with respect to the operation amount of the steering handle (19). And the second hydraulic pump (26)
A steering operation adapted to the characteristics of the vehicle or the contents of agricultural work is set to improve the steering function and handling operability.

As is apparent from the above description, the driving force is applied to the left and right traveling crawlers (2) through the speed change member (25) whose traveling speed can be changed steplessly by operating the main shifting lever (73) which is the traveling shifting lever. And the amount of operation of the main shift lever (73) in a mobile agricultural machine that operates the steering member (28) with the steering handle (19) to change the drive speed difference between the left and right traveling crawlers (2) steplessly. The vehicle speed determined by the steering wheel (19) is reduced in proportion to the operation amount of the steering wheel (19), and the reduction ratio of the vehicle speed to the operation amount of the steering wheel (19) is made changeable.
9) Reduce the amount of deceleration of the vehicle speed with respect to the operation amount, improve the wet field traveling performance with a smooth turning feeling, improve the work efficiency in work that does not require spin turns, and improve the traveling performance in wet field work. A hand operation member (226) for changing the reduction ratio of the vehicle speed with respect to the operation amount of the steering handle (19) is provided to facilitate the steering operation suitable for the driver or the work content or wetland work. Thus, the power loss is reduced and the steering function is improved.

Further, a speed change motor (196) which is a speed change actuator for detecting the operation amount of the main speed change lever (73) and controlling the output of the speed change member (25) is provided, and the main speed change lever (73) and the speed change member (25) are provided. A) a steering actuator that simplifies the mounting and control structure, improves handling operability such as maintenance and adjustment, and detects the amount of operation of the steering handle (19) to output-control the steering member (28). The steering motor (197) is provided, and the steering handle (1) is provided.
9) and simplification of the mounting and control structure of the steering member (28) and improvement of handling operability such as maintenance and adjustment.

Then, as shown in the flowchart of FIG. 33, the main transmission sensor (224) and the sub transmission sensor (22)
5) The controller (228) is inputted from the steering angle sensor (223), the feeling setting device (227), and the straight traveling sensor (165). In addition, the auxiliary transmission lever (74)
When the vehicle is in the neutral position, the turning output disconnection control is performed to disengage the steering output clutch (62) to stop the second hydraulic motor (27), and when the main shift lever (73) is in the neutral position, the turning output disconnection control is performed. On the other hand, when the steering handle (19) is in the straight traveling position, the output of the second hydraulic motor (27) is stopped by the steering output clutch (62) disengagement control. In addition, when the sub-shift is medium speed or low speed, the main shift is other than neutral, and the steering handle (19) is operated other than straight ahead, the input of the main shift sensor (224) and the input of the steering angle sensor (223) are performed. The main shift deceleration amount, the steering amount, and the steering direction are calculated and determined by the main shift and the main shift and steering control operate the shift motor (196) and the steering motor (197), and the left and right traveling crawlers (2) and (2) are operated. ) By changing the driving speed to change the alignment path and change the direction by spin turn at the headland on the field, and perform harvesting work for continuously cutting and threshing grain culm. The steering handle (19) ) The final speed of the vehicle speed decelerated in accordance with the operation angle is determined by the hand operation member (22).
6) When the feeling setting device (227) is operated, the speed is changed steplessly. For example, in road running or dry field work, when the vehicle speed deceleration amount is increased relative to the operation amount of the steering wheel (19), a sensitive turn becomes possible. Reducing the vehicle speed deceleration provides a smooth turning feeling, and reducing the vehicle speed deceleration when wetland work or a spin turn is not required improves wetland running performance and greatly manipulates the steering wheel (19). However, sharp turns due to spin turns are prevented.

Further, as shown in FIG. 34, switching between the deceleration in which the vehicle speed is reduced by the angle of the steering handle (19) and the non-deceleration in which the vehicle speed is not decelerated is selected by the feeling lever (195) or the hand operation member (226). A spin turn that reverses the traveling crawler (2) at the maximum angle of the steering handle (19) and a rotation of the traveling crawler (2) at the maximum steering amount of the steering handle (19). The non-spin-turn turning travel, in which the rotation direction is maintained in the same direction as the outer traveling crawler (2), can be selectively switched. By selecting the spin-turn turning travel, turning on a road or a dry field can be performed promptly. Turning performance is improved by selecting a turning operation and improving turning performance on wet or muddy surfaces. It is configured to achieve, such as improvement of the work of.

[0056]

As is apparent from the above embodiments, the present invention provides the right and left traveling crawlers (2) via the speed change member (25) capable of changing the traveling speed steplessly by operating the traveling speed change lever (73). In a mobile agricultural machine that transmits a driving force and operates a steering member (28) with a steering handle (19) to change the drive speed difference between the left and right traveling crawlers (2) steplessly, the steering handle (19) is used. The transmission member (25) is connected to the traveling speed change lever (73) via a cooperative system (178) that reduces the vehicle speed in proportion to the operation amount of the vehicle, and a different one from the cooperative system (178). Three-way (17
The transmission member (25) is connected to the traveling transmission lever (73) in (9), and the transmission member (25) is used by selectively using the cooperative system path (178) and the third system path (179).
The turning performance and the running performance can be changed without rearranging the control structure, and the turning characteristics such as an insensitive turning feeling or an agile turning feeling can be easily selected.

Further, a feeling switching member (195) for selecting a deceleration input from the cooperative path (178) and a speed change operation input from another third path (179) is provided. Speed control using the road (178) and the third system road (17
Switching of the shift control using 9) can be easily performed by operating the feeling switching member (195), so that the steering function can be improved and the handling operation can be simplified easily.

Further, a deceleration input from the cooperative path (178) and a speed change operation input from another third path (179) are selected on the same axis and the speed change member (2
5) is controlled, and the traveling speed change lever (73), the steering handle (19), and the speed change member (2) are controlled.
The connection mechanism during 5) can be easily simplified and made compact, and workability such as assembly and adjustment can be easily improved.

A spin-turn turning operation for reversing the traveling crawler (2) inside the turning operation and a steering handle (1) are performed.
9) The non-spin-turn turning, in which the rotating direction of the inner traveling crawler (2) is maintained in the same direction as the outer running crawler (2) with the maximum operation amount of 9), can be selectively switched. Can be turned quickly on the road or in dry fields, etc., and turning performance on wet or muddy fields can be improved by selecting non-spin-turn turning, and steering can be switched by changing the turning characteristics. It is possible to easily improve the functions and the handling operability.

[Brief description of the drawings]

FIG. 1 is an overall side view of a combine.

FIG. 2 is an overall plan view of the combine.

FIG. 3 is an explanatory diagram of a mission drive system.

FIG. 4 is an explanatory perspective view of a traveling speed change and steering operation unit.

FIG. 5 is an operation explanatory view of the same part.

FIG. 6 is a side view of the steering column.

FIG. 7 is an enlarged side view of the upper part.

FIG. 8 is an enlarged side view of the lower part.

FIG. 9 is a front view of a steering column.

FIG. 10 is an enlarged front view of the same.

FIG. 11 is an enlarged front view of the lower part.

FIG. 12 is an explanatory plan view of FIG. 4;

FIG. 13 is an enlarged view of FIG.

FIG. 14 is a cross-sectional view of a steering column.

FIG. 15 is a diagram illustrating a setting operation.

FIG. 16 is a partial plan view of the upper part of the steering column.

FIG. 17 is a partial view of the same.

FIG. 18 is an operation explanatory view of FIG. 16;

FIG. 19 is an explanatory diagram of the operation of the speed change member.

FIG. 20 is an explanatory diagram of a main speed change operation.

FIG. 21 is an explanatory diagram of a steering operation.

FIG. 22 is a diagram showing main shifting and steering handle operation.

FIG. 23 is an explanatory front view of a traveling speed change output switching unit.

FIG. 24 is a partial explanatory view of the same part.

FIG. 25 is an explanatory diagram of shifting and steering driving.

FIG. 26 is an explanatory plan view of a steering handle portion.

FIG. 27 is a diagram showing a shift and steering control circuit.

FIG. 28 is a diagram showing a steering handle and a turning output.

FIG. 29 is a diagram showing a steering handle and a shift output.

FIG. 30 is a diagram showing a steering handle and a shift output.

FIG. 31 is a diagram showing a main shift lever and a turning output.

FIG. 32 is a diagram showing a steering handle and a turning output.

FIG. 33 is a shift steering control flowchart of FIG. 7;

FIG. 34 is a traveling crawler turning output diagram.

[Explanation of symbols]

(2) Traveling crawler (19) Steering handle (25) Transmission member (28) Steering member (73) Main transmission lever (travel transmission lever) (178) Deceleration output shaft (cooperative path) (179) Direct connection output Shaft (third system path) (195) Feeling lever (Feeling switching member)

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁷ identification code FI G05G 11/00 G05G 11/00 (58) Field surveyed (Int.Cl. ⁷ , DB name) A01D 69/00 A01B 69/00 B62D 11/08 G05G 11/00

Claims (4)

(57) [Claims] A driving force is transmitted to left and right traveling crawlers via a speed change member capable of changing a traveling speed steplessly by operating a traveling speed change lever, and a left and right traveling crawler is operated by operating a steering member with a steering handle. In a mobile agricultural machine in which a difference in drive speed is changed steplessly, a transmission member is connected to a traveling transmission lever via a cooperative system path that reduces the vehicle speed in proportion to the amount of operation of a steering handle, and the cooperative system A mobile agricultural machine wherein a transmission member is connected to a traveling transmission lever on a third system road different from the road. 2. The mobile agricultural machine according to claim 1, further comprising a feeling switching member for selecting a deceleration input from a cooperative route and a shift operation input from another third route. 3. The transmission member is selected by selecting a deceleration input from a cooperative path and a shift operation input from another third path on the same axis and controlling the transmission member by one of the inputs. The mobile agricultural machine according to claim 1, wherein: 4. A spin-turn turning operation for reversing a traveling crawler inside the turning operation, and a non-spin-turn turning operation for maintaining the rotation direction of the traveling crawler inside the turning operation in the same direction as the outer traveling crawler with a maximum operation amount of a steering wheel. The mobile agricultural machine according to claim 1, wherein the mobile agricultural machine can be selectively switched.